Ingredients

  • 1 1/2 lbs. boneless sirloin steak, 1-inch thick
  • kosher salt
  • freshly ground black pepper
  • 1 cup dry white wine such as Chardonnay
  • 2 Tbs. white wine vinegar
  • 1 small shallot, minced
  • 1 Tbs. olive oil
  • 6 Tbs. unsalted butter (1 Tbs. set aside and the remaining 5 Tbs. cut into small pieces and chilled)
  • 2 Tbs. finely chopped fresh tarragon

Method

  • Preheat oven to 400 degrees F. Season steak on both sides with salt and pepper and refrigerate.
  • Combine wine, vinegar and shallot in a small saucepan and bring to a boil.
  • Reduce heat to medium-low and simmer until mixture is reduced to two tablespoons, 15-20 minutes.
  • Meanwhile, heat a large, heavy, ovenproof skillet over medium-high heat.
  • When it's hot, add oil and reserved tablespoon of butter.
  • When butter is melted, add steak and sear for one minute.
  • Reduce heat and continue to cook until the first side is golden brown and beginning to crisp, about three minutes longer.
  • Turn the steak with tongs and sear the other side until well-browned, two or three minutes.
  • Place pan in oven and finish cooking, turning once, 6-8 minutes for medium-rare.
  • Transfer steak to a platter and loosely cover with foil to keep warm.
  • To finish sauce, put it through a fine strainer, pressing on shallots.
  • Whisk the five tablespoons of cold butter a few pieces at a time into warm reduction until you have a creamy sauce.
  • Stir in tarragon to taste and season with salt and pepper.
  • Slice steak into half-inch thick slices across grain, spoon sauce on top and serve.